Adjustable Feedback Control Device For Acoustic Guitar

As Feedback Controller By rotating the knob to fully close the sound hole, two side air vents get activated to still allow acoustic tones to come out from the guitar while preventing unwanted feedback. In open position, it allows acoustic guitars with installed sound hole pickup volume/eq controls to be accessed (remounting of pickup controller could be required). As Volume Controller From half-open to fully closed knob positions, it dampens and controls acoustic guitar volume. The side sound vents redirects the sound flow directly upwards to the guitar player when fully closed. Specs: Made of black rubber and clear tinted nylon plastic The rubber has multiple grips to prevent rotational movement. Easy to insert/remove. Ergonomic design and guitar-finish friendly. It will fit all standard 4-inch diameter acoustic guitar sound holes www.teracoustix.com